package com.yundin.interceptor;
import com.yundin.constant.JwtClaimsConstant;
import com.yundin.context.BaseContext;
import com.yundin.properties.JwtProperties;
import com.yundin.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenUserInterceptor implements HandlerInterceptor {
    @Autowired
    private JwtProperties jwtProperties;
/**
 * 校验jwt
 * @param request
 * @param response
 * @param handler
 * @return
 * @throws Exception
 */
public boolean preHandle(HttpServletRequest request, HttpServletResponse
        response, Object handler) throws Exception {
//判断当前拦截到的是Controller的方法还是其他资源
    if (!(handler instanceof HandlerMethod)) {
//当前拦截到的不是动态方法，直接放行
        return true;
    }
//1、从请求头中获取令牌
    String token = request.getHeader(jwtProperties.getUserTokenName());
//2、校验令牌
    try {
        log.info("jwt校验:{}", token);
        Claims claims = JwtUtil.parseJWT(jwtProperties.getUserSecretKey(),
                token);
        Long userId =
                Long.valueOf(claims.get(JwtClaimsConstant.USER_ID).toString());
        log.info("当前用户的id：", userId);
        BaseContext.setCurrentId(userId);
//3、通过，放行
        return true;
    } catch (Exception ex) {
//4、不通过，响应401状态码
        response.setStatus(401);
        return false;
    }
    }
}
